These are the instructions taken directly from the DDY062 manual: Alarm mute for the PROGRAMME END The alarm for the programme end may be muted as follows: IMPORTANT The dishwasher must be ALWAYS off before start this procedure. 1. Hold down the "PROGRAMME SELECTION" button and at the same time switch on the dishwasher by pressing the "ON/OFF" button (a brief audible signal will sound). 2. Keep the "PROGRAMME SELECTION" button pressed for at least 15 seconds (during this time, 2 audible signals will sound). 3. Release the button when the second audible signal sounds (3 "PROGRAMME SELECTION" indicator lights will come on). 4. Press the same button again: the 3 indicator lights (which indicate that the alarm is activated) will start flashing (to indicate that the alarm is off). 5. Turn off the dishwasher by pressing the "ON/OFF" button to confirm the new setting. To turn the alarm on again, follow the same procedure.
E4 means that the dishwasher has a problem with discharging water. Check that the discharge tube is not bent and the siphon is not blocked and the filters are not blocked. Depending on how you stored the dishwasher, check for evidence of rodents or insects building nests in the unit.